Air conditioner box damper structure capable of preventing whistling and abnormal sound

Abstract

The application provides an air conditioner box air door structure capable of preventing howling and abnormal sound, comprising an air door shaft and an air door plate arranged on the air door shaft, the air door plate is integrally formed with the air door shaft, and a soft rubber sleeve is arranged on the air door plate; a plurality of equidistantly arranged trapezoidal blocks are arranged on the soft rubber sleeve, the trapezoidal blocks are made of the same material as the soft rubber sleeve, and the trapezoidal blocks are integrally formed with the soft rubber sleeve. The air conditioner box air door structure capable of preventing howling and abnormal sound can guide the air flow during the closing of the air door, so that the howling is avoided, the air door can be buffered when the air door is closed, the impact sound of the air door is avoided, and the user comfort is improved.

Description

Technical Field

[0001] This invention relates to the field of automotive air conditioning technology, and in particular to an air conditioning unit damper structure that prevents whistling and abnormal noise. Background Technology

[0002] The automotive air conditioning unit is a core component of the vehicle's air conditioning system. Its main function is to regulate the temperature, humidity, and airflow inside the vehicle, providing a comfortable travel experience. The air damper is another important part of the automotive air conditioning system, primarily responsible for controlling the mixing and distribution of hot and cold air, as well as controlling the airflow between the inside and outside of the vehicle, thereby regulating the temperature, humidity, and airflow inside the vehicle and providing a comfortable travel experience.

[0003] Automotive air conditioning unit dampers are typically installed in front of the evaporator and are controlled by damper actuators and servo motors. They automatically adjust the damper opening according to the vehicle's preset temperature and humidity levels, ensuring efficient operation of the air conditioning system and improving the comfort of the in-vehicle environment. Automotive air conditioning unit dampers are generally divided into temperature dampers, mode dampers, and inside / outside air conversion dampers. The temperature damper controls the mixing ratio of hot and cold air, the mode damper controls the air outlets for hot and cold air, and the inside / outside air conversion damper controls the airflow between the inside and outside of the vehicle.

[0004] When the air conditioning unit's damper is sealed, the relationship between the damper and the housing is: some distance, close contact, and interference fit. During this process, the damper and housing engage either through direct surface contact or direct line contact. Both contact surfaces are relatively large and continuous. Therefore, if the sealing surfaces of the housing and damper are slightly deformed or not smooth, whistling noise can easily occur. If the damper moves too quickly, it can also produce a "bang" impact sound, which can easily lead to user complaints and affect comfort. Summary of the Invention

[0005] To address the technical problem that a whistling sound can easily occur during the closing of the air vent when the sealing surface between the car air conditioning unit housing and the vent is slightly deformed or not smooth, and that a "bang" sound can be produced when the vent moves too fast, affecting user comfort, this invention provides an air conditioning unit vent structure to prevent whistling and abnormal noise.

[0006] To solve the above-mentioned technical problems, the air conditioning unit damper structure for preventing whistling and abnormal noise provided by the present invention includes a damper shaft and a damper plate disposed on the damper shaft. The damper plate is integrally formed with the damper shaft, and a soft rubber sleeve is fitted on the damper plate. The soft rubber sleeve is provided with a plurality of trapezoidal blocks arranged at equal intervals. The trapezoidal blocks are made of the same material as the soft rubber sleeve, and the trapezoidal blocks are integrally formed with the soft rubber sleeve.

[0007] Preferably, the damper shaft is provided with a plurality of hollowed-out portions, which are evenly spaced.

[0008] Preferably, the damper plate is provided with reinforcing ribs, and the reinforcing ribs are integrally formed with the damper plate.

[0009] Preferably, the damper panel is divided into a door panel edge portion and a door panel body portion, which are integrally formed. The thickness of the door panel body portion is less than the thickness of the door panel edge portion. The soft rubber sleeve is divided into a rubber sleeve body portion and a rubber sleeve limiting portion, which are integrally formed. The rubber sleeve body portion is fitted onto the door panel edge portion of the damper panel, while the rubber sleeve limiting portion is engaged at the connection between the door panel body portion and the door panel edge portion. The rubber sleeve limiting portion is in close contact with both sides of the door panel body portion.

[0010] Preferably, the two ends of the damper shaft are respectively provided with a first cylindrical shaft and a second cylindrical shaft for rotatably connecting with the car air conditioning unit housing.

[0011] Preferably, one end of the damper shaft is provided with a rotating groove, the first cylindrical shaft extends into the rotating groove, one end of the first cylindrical shaft is integrally formed with a first rotating shaft, a sealed bearing is fixedly sleeved on the first rotating shaft, and the outer ring of the sealed bearing is fixedly connected to the inner wall of the rotating groove.

[0012] Preferably, the other end of the damper shaft is provided with a sliding connection mechanism for connecting the second cylindrical shaft to the damper shaft. The sliding connection mechanism includes a cylindrical tube, a transmission block, and an annular cover. A first cylindrical groove is formed at the end of the damper shaft away from the first cylindrical shaft. The cylindrical tube is disposed at one end of the second cylindrical shaft and is integrally formed with the second cylindrical shaft. The outer diameters of the cylindrical tube and the second cylindrical shaft are the same, and both the cylindrical tube and the second cylindrical shaft are slidably connected to the inner wall of the first cylindrical groove. A plurality of annularly distributed first sliding grooves are formed on the inner wall of the first cylindrical groove. A plurality of annularly distributed second sliding grooves are formed on the outer wall of the cylindrical tube. A transmission block is slidably installed in each of the plurality of second sliding grooves. The plurality of transmission blocks are slidably connected to the inner walls of the plurality of first sliding grooves respectively. The annular cover is located in the first cylindrical groove and is fixedly connected to the cylindrical tube by countersunk screws. The annular cover blocks the transmission block and restricts it within the second sliding groove of the cylindrical tube.

[0013] Preferably, the first cylindrical groove is further provided with a telescopic mechanism for extending and retracting the second cylindrical shaft within the first cylindrical groove under the action of an external force. The telescopic mechanism includes a slide rod and a spring. The slide rod is installed at one end of the second cylindrical shaft. A receiving groove is formed on one side inner wall of the first cylindrical groove. The slide rod extends into the receiving groove and is slidably connected to the inner wall of the receiving groove. The spring is slidably sleeved on the slide rod. The diameter of the spring is larger than the inner diameter of the receiving groove. A threaded groove is formed at one end of the second cylindrical shaft. An external thread adapted to the threaded groove is formed on the outer wall of one end of the slide rod. The slide rod is threadedly installed on the inner wall of the threaded groove.

[0014] Preferably, the second cylindrical shaft is equipped with a connecting assembly for engaging with the drive mechanism of the air conditioning unit damper. The connecting assembly includes a cylindrical rod, a plurality of teeth, a second rotating shaft, and a meshing rod. The plurality of teeth are distributed in a ring on the outer wall of the cylindrical rod and are integrally formed with the cylindrical rod. A second cylindrical groove is formed at one end of the second cylindrical shaft. The cylindrical rod is located in the second cylindrical groove and is adapted to the second cylindrical groove. A plurality of tooth grooves are formed on the inner wall of the second cylindrical groove. The plurality of teeth respectively mesh in the plurality of tooth grooves. The second rotating shaft is located at one end of the cylindrical rod and is integrally formed with the cylindrical rod. The meshing rod is located at the end of the second rotating shaft away from the cylindrical rod. The meshing rod is used for engaging with the drive mechanism of the air conditioning unit damper.

[0015] Preferably, an operating port is provided on one side of the damper shaft for installing an annular cover to fix it to the cylindrical tube.

[0016] Beneficial effects: By setting two rows of trapezoidal blocks on the soft rubber sleeve of the damper plate used for sealing with the air conditioning unit housing, the airflow can be guided during the damper closing process, thus avoiding whistling. Furthermore, during damper closing, the trapezoidal blocks first contact the car's air conditioning unit housing, deforming to increase the buffering effect during damper sealing, preventing a "bang" impact sound and improving user comfort. By setting a rotating groove on the damper shaft and a first rotating shaft rotatably connected to the damper shaft on the first cylindrical shaft, rotational friction between the first cylindrical shaft and the volute on the air conditioning unit housing is avoided, preventing wear. The sliding connection mechanism and extension... The retraction mechanism allows the second cylindrical shaft to move axially while rotating to rotate the damper shaft, enabling it to retract into the damper shaft. This facilitates the installation of the damper shaft on the air conditioning unit housing. Furthermore, in cases of significant wear and tear from long-term use, the second cylindrical shaft can be easily replaced without replacing the entire damper shaft and damper, saving costs. By providing a connecting component that connects to the second cylindrical shaft and the door sealing drive mechanism, the connecting component can be easily detached from the second cylindrical shaft when it drives the first cylindrical shaft to rotate, thereby rotating the damper shaft. This allows for easy replacement of the connecting component in cases of severe wear or damage. Attached Figure Description

[0017] Figure 1 A front view schematic diagram of the first embodiment of the anti-whistling and abnormal noise air conditioner unit damper structure provided by the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of the present invention;

[0019] Figure 3 This is a front sectional view of a second embodiment of the anti-whistling and abnormal noise air conditioner unit damper structure provided by the present invention.

[0020] Figure 4 for Figure 3 An enlarged structural diagram of part A shown in the figure;

[0021] Figure 5 for Figure 3 An enlarged structural diagram of part B shown in the figure;

[0022] Figure 6 This is a side sectional view of the damper shaft in this invention.

[0023] Figure 7 This is a side view of the assembly of the cylindrical tube and the transmission bar in this invention;

[0024] Figure 8 This is a side view of the connecting component in this invention.

[0025] Figure 9 This is a side sectional view of the second cylindrical shaft in this invention.

[0026] Figure 10 This is a schematic diagram of the operating port opened on the damper shaft in this invention.

[0027] The following are the labeling elements in the diagram: 1. Damper shaft; 2. Trapezoidal block; 3. Soft rubber sleeve; 4. Damper panel; 5. Hollowed-out part; 6. Reinforcing rib; 7. First cylindrical shaft; 8. Second cylindrical shaft; 9. Rotating groove; 10. First rotating shaft; 11. First cylindrical groove; 12. Cylindrical tube; 13. Transmission bar; 14. First sliding groove; 15. Sliding rod; 16. Receiving groove; 17. Spring; 18. External thread; 19. Threaded groove; 20. Connecting assembly; 21. Cylindrical rod; 22. Tooth; 23. Second rotating shaft; 24. Engaging rod; 25. Second cylindrical groove; 26. Tooth groove; 27. Annular cover; 31. Main body of rubber sleeve; 32. Limiting part of rubber sleeve; 41. Edge of door panel; 42. Main body of door panel. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0029] First embodiment:

[0030] Please refer to the following: Figure 1-2 The air conditioning unit damper structure for preventing whistling and abnormal noise includes a damper shaft 1 and a damper plate 4 disposed on the damper shaft 1. The damper plate 4 is integrally formed with the damper shaft 1, and a soft rubber sleeve 3 is fitted on the damper plate 4. The soft rubber sleeve 3 is provided with a plurality of trapezoidal blocks 2 arranged at equal intervals. The trapezoidal blocks 2 are made of the same material as the soft rubber sleeve 3, and the trapezoidal blocks 2 and the soft rubber sleeve 3 are integrally formed.

[0031] During the closing process of the damper, two rows of trapezoidal blocks 2 made of the same material as the soft rubber sleeve 3 are set on the basis of the ordinary damper structure to guide the airflow and avoid whistling. In addition, during the closing process, at the beginning of contact, the edge contact surface of the trapezoidal block 2 is small, close to point contact. The trapezoidal block 2 first contacts the car air conditioning box housing, and the trapezoidal block 2 deforms. This can increase the buffering effect when the damper is sealed, avoid the "bang" damper impact sound, and improve user comfort.

[0032] As the damper continues to close, the edge of the soft rubber sleeve 3 fitted on the side of the damper plate 4 is first compressed and sealed (line seal) with the car air conditioning housing. As the damper continues to close until it is fully closed, one side of the soft rubber sleeve 3 contacts the housing and is compressed and sealed.

[0033] Therefore, by setting trapezoidal block 2, the product quality of the damper can be improved without affecting its sealing performance, while also preventing whistling during the damper's closing process and avoiding the "bang" sound of the damper colliding with the car's air conditioning unit housing.

[0034] The damper shaft 1 is provided with a plurality of hollowed-out portions 5, which are evenly spaced. By providing hollowed-out portions 5 on the damper shaft 1, the material used in the damper shaft 1 can be reduced without significantly weakening the strength of the damper shaft 1, thereby reducing costs and weight, and thus reducing the load on the damper drive mechanism.

[0035] The damper plate 4 is provided with reinforcing ribs 6, which are integrally formed with the damper plate 4. By providing reinforcing ribs 6 on the damper plate 4, the strength of the damper plate 4 can be improved, thereby increasing the service life of the damper plate 4.

[0036] The damper panel 4 is divided into a panel edge portion 41 and a panel body portion 42, which are integrally formed. The thickness of the panel body portion 42 is less than that of the panel edge portion 41. The soft rubber sleeve 3 is divided into a sleeve body portion 31 and a sleeve limiting portion 32, which are integrally formed. The sleeve body portion 31 is fitted onto the panel edge portion 41 of the damper panel 4, while the sleeve limiting portion 32 is engaged at the connection between the panel body portion 42 and the panel edge portion 41. The sleeve limiting portion 32 is in close contact with both sides of the panel body portion 42, thus securing the sleeve limiting portion 32 at the connection between the panel body portion 42 and the panel edge portion 41. This prevents the soft rubber sleeve 3 from easily detaching from the damper panel 4 and makes installation relatively convenient.

[0037] The damper shaft 1 is provided with a first cylindrical shaft 7 and a second cylindrical shaft 8 at both ends, which are used to rotatably connect with the car air conditioning unit housing. Through the rotatable connection between the first cylindrical shaft 7 and the second cylindrical shaft 8 and the car air conditioning unit housing, the damper shaft 1 can rotate stably during the opening and closing of the damper.

[0038] Compared with related technologies, the anti-whistling and abnormal noise air conditioning unit damper structure provided by the present invention has the following beneficial effects:

[0039] This invention provides an air conditioning unit damper structure to prevent whistling and abnormal noise. By setting two rows of trapezoidal blocks 2 on the soft rubber sleeve 3 of the damper plate 4 for sealing with the air conditioning unit housing, the airflow can be guided during the damper closing process, thereby avoiding whistling. Furthermore, during the damper closing process, the trapezoidal blocks 2 first come into contact with the car air conditioning unit housing, and the trapezoidal blocks 2 deform, which can increase the buffering effect when the damper is sealed, avoid the "bang" damper impact sound, and improve user comfort.

[0040] Second embodiment:

[0041] Based on the anti-whistling and abnormal noise air conditioning unit damper structure provided in the first embodiment of this application, the second embodiment of this application proposes another anti-whistling and abnormal noise air conditioning unit damper structure. The second embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the separate implementation of the first embodiment.

[0042] The second embodiment of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0043] Please refer to the following: Figure 3-10 The air conditioning unit damper structure for preventing whistling and abnormal noise also includes a rotating groove 9 opened at one end of the damper shaft 1. The first cylindrical shaft 7 extends into the rotating groove 9. One end of the first cylindrical shaft 7 is integrally formed with a first rotating shaft 10. A sealed bearing is fixedly sleeved on the first rotating shaft 10. The outer ring of the sealed bearing is fixedly connected to the inner wall of the rotating groove 9.

[0044] In this embodiment, when installing the damper shaft 1 on the air conditioning unit housing, one end of the first cylindrical shaft 7 is first inserted into the volute on one side of the air conditioning unit housing. When the door rotates during use, the damper shaft 1 rotates on the first rotating shaft 10 through the sealed bearing. This allows the first cylindrical shaft 7 to not rotate relative to the volute while the volute supports the damper shaft 1, thus avoiding rotational friction between the first cylindrical shaft 7 and the air conditioning unit housing, thereby preventing wear and extending the service life of the damper.

[0045] The other end of the damper shaft 1 is provided with a sliding connection mechanism for connecting the second cylindrical shaft 8 to the damper shaft 1. The sliding connection mechanism includes a cylindrical tube 12, a transmission block 13, and an annular cover 27. A first cylindrical groove 11 is formed at the end of the damper shaft 1 away from the first cylindrical shaft 7. The cylindrical tube 12 is disposed at one end of the second cylindrical shaft 8 and is integrally formed with the second cylindrical shaft 8. The outer diameters of the cylindrical tube 12 and the second cylindrical shaft 8 are the same, and both the cylindrical tube 12 and the second cylindrical shaft 8 are slidably connected to the inner wall of the first cylindrical groove 11. The inner wall of the first cylindrical groove 11 is provided with a plurality of annularly distributed first sliding grooves 14, and the outer wall of the cylindrical tube 12 is provided with a plurality of annularly distributed second sliding grooves. A transmission block 13 is slidably installed in each of the plurality of second sliding grooves. The plurality of transmission blocks 13 are slidably connected to the inner wall of the plurality of first sliding grooves 14 respectively. The annular cover 27 is located in the first cylindrical groove 11, and the annular cover 27 is fixedly connected to the cylindrical tube 12 by countersunk screws. The annular cover 27 blocks the transmission blocks 13 and restricts them within the second sliding grooves of the cylindrical tube 12.

[0046] In this embodiment, when the damper in the air conditioning unit system rotates, it can drive the cylindrical cylinder 12 to rotate through the second cylindrical shaft 8. The cylindrical cylinder 12 rotates the damper shaft 1 through several transmission blocks 13, thereby realizing the rotation of the damper plate 4, thus enabling the damper to open and close.

[0047] Furthermore, the transmission block 13 can move axially within the first groove 14 inside the damper shaft 1, thereby allowing the second cylindrical shaft 8 to retract into the first cylindrical groove 11 of the damper shaft 1. This allows for easier installation of the damper shaft 1 on the air conditioning unit housing. First, the second cylindrical shaft 8 is retracted into the first cylindrical groove 11, then the first cylindrical shaft 7 is installed in one side of the volute of the air conditioning unit housing. Finally, the second cylindrical shaft 8 is aligned with the other volute and extended from the first cylindrical groove 11 into the volute. This facilitates the easy installation and removal of the damper shaft 1. During prolonged use, after significant wear occurs between the second cylindrical shaft 8 and the volute of the air conditioning unit housing, the damper shaft 1 can be easily removed, allowing for convenient replacement of the second cylindrical shaft 8 (here, the second cylindrical shaft 8 and the cylindrical cylinder 12 are replaced as a set). This prevents excessive wear between the second cylindrical shaft 8 and the volute from affecting the stability of the damper rotation and the sealing performance when the damper is closed.

[0048] The first cylindrical groove 11 is also provided with a telescopic mechanism for extending and retracting the second cylindrical shaft 8 within the first cylindrical groove 11 under the action of external force. The telescopic mechanism includes a slide rod 15 and a spring 17. The slide rod 15 is installed at one end of the second cylindrical shaft 8. A receiving groove 16 is formed on one side inner wall of the first cylindrical groove 11. The slide rod 15 extends into the receiving groove 16 and is slidably connected to the inner wall of the receiving groove 16. The spring 17 is slidably sleeved on the slide rod 15. The diameter of the spring 17 is larger than the inner diameter of the receiving groove 16. A threaded groove 19 is formed at one end of the second cylindrical shaft 8. An external thread 18 that matches the threaded groove 19 is formed on the outer wall of one end of the slide rod 15. The slide rod 15 is threadedly installed on the inner wall of the threaded groove 19.

[0049] In this embodiment, under the elastic force of the spring 17, the second cylindrical shaft 8 is in a state of extending out of the first cylindrical groove 11 on the damper shaft 1, so that during the use of the damper, the second cylindrical shaft 8 can always be inside the volute of the air conditioning unit housing, and when it is necessary to retract the second cylindrical shaft 8 into the first cylindrical groove 11, it is only necessary to overcome the elastic force of the spring 17 to retract the second cylindrical shaft 8 into the first cylindrical groove 11.

[0050] The second cylindrical shaft 8 is equipped with a connecting assembly 20 for engaging with the drive mechanism of the air conditioning unit damper. The connecting assembly 20 includes a cylindrical rod 21, a plurality of teeth 22, a second rotating shaft 23, and a meshing rod 24. The plurality of teeth 22 are distributed in a ring on the outer wall of the cylindrical rod 21 and are integrally formed with the cylindrical rod 21. A second cylindrical groove 25 is provided at one end of the second cylindrical shaft 8. The cylindrical rod 21 is located in the second cylindrical groove 25 and is adapted to the second cylindrical groove 25. A plurality of tooth grooves 26 are provided on the inner wall of the second cylindrical groove 25. The plurality of teeth 22 respectively mesh in the plurality of tooth grooves 26. The second rotating shaft 23 is located at one end of the cylindrical rod 21 and is integrally formed with the cylindrical rod 21. The meshing rod 24 is located at the end of the second rotating shaft 23 away from the cylindrical rod 21. The meshing rod 24 is used for engaging with the drive mechanism of the air conditioning unit damper.

[0051] In this embodiment, it should be noted that in a typical damper structure, the component at one end of the damper shaft 1 that meshes with the damper drive mechanism is also made of plastic, which is prone to wear and even damage, and replacement is relatively troublesome. However, in this embodiment, by providing a connecting component 20 that can be connected to the second cylindrical shaft 8 and the door sealing drive mechanism, the connecting component 20 can be easily removed from the second cylindrical shaft 8 when it can drive the second cylindrical shaft 8 to rotate, thereby causing the damper shaft 1 to rotate, thus facilitating the replacement of the connecting component 20.

[0052] An operating port is provided on one side of the damper shaft 1 for installing an annular cover 27 to fix it to the cylindrical tube 12.

[0053] In this embodiment, after installing each transmission block 13 in the first sliding groove 14 within the first cylindrical groove 11 of the damper shaft 1, the second sliding groove on the cylindrical tube 12 is aligned with each transmission block 13, allowing it to slide in from one end of the second sliding groove. The transmission block 13 then slides into the second sliding groove. The annular cover 27 is then fixed to the cylindrical tube 12 with countersunk screws using a screwdriver or other tools through the operating port. This achieves the installation of the second cylindrical shaft 8 on the damper shaft 1. Disassembling the second cylindrical shaft 8 can be done by reversing the operation.

[0054] It should be noted that in a typical damper structure, the two ends of the damper shaft 1 rotate directly within the volutes installed on the car air conditioning unit housing. There is rotational friction between the two ends of the damper shaft 1 and the volutes used to restrict the two ends of the damper shaft 1. With prolonged use, both the damper shaft 1 and the volutes are made of plastic, and wear will occur between them. As wear accumulates, a gap will form between the damper shaft 1 and the volutes, and this gap will become larger and larger with prolonged use. This will cause the damper to rotate unstably during opening and closing, and when the damper is closed, it will reduce the sealing between it and the air conditioning unit housing, resulting in air leakage.

[0055] Furthermore, the damper shaft 1 cannot move left or right in the axial direction during installation, which makes the installation of the damper more troublesome and requires disassembling one side of the air conditioning unit housing.

[0056] In this embodiment, a rotating groove 9 is provided on the damper shaft 1, and a first rotating shaft 10 is provided on the first cylindrical shaft 7 and rotatably connected to the damper shaft 1, so as to avoid wear caused by rotational friction between the first cylindrical shaft 7 and the volute on the air conditioning unit housing.

[0057] By setting a sliding connection mechanism and a telescopic mechanism, the second cylindrical shaft 8 can move along the axial direction while rotating the damper shaft 1, so that the second cylindrical shaft 8 can retract into the damper shaft 1. This makes it convenient to install the damper shaft 1 on the air conditioning unit housing. In the event of significant wear caused by long-term use, the second cylindrical shaft 8 can be easily replaced without replacing the entire damper shaft 1 and the damper, thus saving costs.

[0058] Furthermore, by providing a connecting component 20 that is connected to the second cylindrical shaft 8 and the door sealing drive mechanism, the connecting component 20 can drive the second cylindrical shaft 8 to rotate, thereby causing the damper shaft 1 to rotate. This allows the connecting component 20 to be easily removed from the second cylindrical shaft 8, making it convenient to replace the connecting component 20 when it is severely worn or damaged.

Claims

1. An air conditioning unit damper structure for preventing whistling and abnormal noise, comprising a damper shaft and a damper plate disposed on the damper shaft, characterized in that: The damper plate and the damper shaft are integrally formed, and a soft rubber sleeve is fitted on the damper plate; The soft rubber sleeve is provided with a number of equally spaced trapezoidal blocks, the trapezoidal blocks are made of the same material as the soft rubber sleeve, and the trapezoidal blocks and the soft rubber sleeve (3) are integrally formed; The damper panel is divided into a door panel edge portion and a door panel body portion, which are integrally formed. The thickness of the door panel body portion is less than that of the door panel edge portion. The soft rubber sleeve is divided into a rubber sleeve body portion and a rubber sleeve limiting portion, which are integrally formed. The rubber sleeve body portion is fitted onto the door panel edge portion of the damper panel, while the rubber sleeve limiting portion is engaged at the connection between the door panel body portion and the door panel edge portion. The rubber sleeve limiting portion is in close contact with both sides of the door panel body portion. The damper shaft is provided with a first cylindrical shaft and a second cylindrical shaft at both ends for rotatably connecting with the car air conditioning unit housing; A rotating groove is also provided at one end of the damper shaft. The first cylindrical shaft extends into the rotating groove. A first rotating shaft is integrally formed at one end of the first cylindrical shaft. A sealed bearing is fixedly sleeved on the first rotating shaft. The outer ring of the sealed bearing is fixedly connected to the inner wall of the rotating groove. The other end of the damper shaft is provided with a sliding connection mechanism for connecting the second cylindrical shaft to the damper shaft. The sliding connection mechanism includes a cylindrical tube, a transmission block, and an annular cover. A first cylindrical groove is opened at the end of the damper shaft away from the first cylindrical shaft. The cylindrical tube is disposed at one end of the second cylindrical shaft and is integrally formed with the second cylindrical shaft. The outer diameters of the cylindrical tube and the second cylindrical shaft are the same, and both the cylindrical tube and the second cylindrical shaft are slidably connected to the inner wall of the first cylindrical groove. A plurality of annularly distributed first sliding grooves are opened on the inner wall of the first cylindrical groove. A plurality of annularly distributed second sliding grooves are opened on the outer wall of the cylindrical tube. A transmission block is slidably installed in each of the plurality of second sliding grooves. The plurality of transmission blocks are slidably connected to the inner walls of the plurality of first sliding grooves respectively. The annular cover is located in the first cylindrical groove and is fixedly connected to the cylindrical tube by countersunk screws. The annular cover blocks the transmission block and restricts it within the second sliding groove of the cylindrical tube. The first cylindrical groove is also provided with a telescopic mechanism for extending and retracting the second cylindrical shaft within the first cylindrical groove under the action of an external force. The telescopic mechanism includes a slide rod and a spring. The slide rod is installed at one end of the second cylindrical shaft. A receiving groove is formed on one side inner wall of the first cylindrical groove. The slide rod extends into the receiving groove and is slidably connected to the inner wall of the receiving groove. The spring is slidably sleeved on the slide rod. The diameter of the spring is larger than the inner diameter of the receiving groove. A threaded groove is formed at one end of the second cylindrical shaft. An external thread adapted to the threaded groove is formed on the outer wall of one end of the slide rod. The slide rod is threadedly installed on the inner wall of the threaded groove. The second cylindrical shaft is equipped with a connecting assembly for engaging with the drive mechanism of the air conditioning unit damper. The connecting assembly includes a cylindrical rod, a plurality of teeth, a second rotating shaft, and a meshing rod. The plurality of teeth are distributed in a ring on the outer wall of the cylindrical rod and are integrally formed with the cylindrical rod. A second cylindrical groove is formed at one end of the second cylindrical shaft. The cylindrical rod is located in the second cylindrical groove and is adapted to the second cylindrical groove. A plurality of tooth grooves are formed on the inner wall of the second cylindrical groove. The plurality of teeth respectively mesh in the plurality of tooth grooves. The second rotating shaft is located at one end of the cylindrical rod and is integrally formed with the cylindrical rod. The meshing rod is located at the end of the second rotating shaft away from the cylindrical rod. The meshing rod is used for engaging with the drive mechanism of the air conditioning unit damper.

2. The anti-whistling and abnormal noise air conditioning unit damper structure according to claim 1, characterized in that, The damper shaft has several hollow sections, which are evenly spaced.

3. The anti-whistling and abnormal noise air conditioning unit damper structure according to claim 1, characterized in that, The damper plate is provided with reinforcing ribs, which are integrally formed with the damper plate.

4. The anti-whistling and abnormal noise air conditioning unit damper structure according to claim 1, characterized in that, An operating port is provided on one side of the damper shaft for installing an annular cover to fix it to the cylindrical tube.

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